 FAVORITE
LINKS
F and G Mechanical
UA Local 274
International Wastewater
Systems
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Some Basics
A few basics sizing your cooling system. I am not going
into the science of sizing the system. I am going to keep it simple, and use
a sizing system that has worked since dinosaurs needed A/C. LOL
400 Square feet per ton!
THATS IT!
If your house is 800 square feet, you need 2 tons of A/C.
If your house is 1200 square feet, you need 3 tons of A/C.
Starting to make sense?? A/C systems are sold in 1/2 ton
increments, and residentially the systems go up to 5 tons. Sizing a system
for commercial applications will be different. Because, we will have to deal
with computers, copy machines, lighting, people etc. All these extra
elements release heat which will have to be included in your calculations.
Over sizing a system in a commercial application will not
hurt. I suggest using the basic sizing plus adding tonnage for all the
elements. How much tonnage to add? That I cannot tell you, without doing a
heat calculation. I will try to find some charts and get that posted here.
Distributing the Air Basics
Now some more basics that the dinosaurs used. We discussed
400 square feet per ton. Now how much air is that? 400 CFM!
I hope this is getting easy. 400 square feet needs 400
CFM(cubic feet per minute). 200 square feet needs 200 CFM. I won't expect
you to use a Ductulator to figure out what size ducts you need to cool a
area. I will post what size duct you will need in the duct sizing pages of
the website. I plan on keeping this site simple and to be be able used
by anyone with no experience in HVAC.
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Quick Recap
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400 SF needs 1 ton of A/C
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400 CFM = 1 ton of A/C
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Commercial sizing is different then residential
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Add tonnage for computers, copy machines etc.
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AC systems come in 1/2 ton increments
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